Electronic typewriter including spelling dictionary

Abstract

The present electronic typewriter executes a spelling check control and, more specifically, judges whether or not a word in a dictionary memory identical to an inputted word exists. If a word does not exists, the word printing operation or sweep display of this word is automatically interrupted by a central processing unit. The present invention further provides an electronic typewriter wherein the operator is freed of the spelling check task and high-speed key-in operation can be achieved by preventing misspelled words from being printed.

What is claimed is: 
     
       1. An electronic typewriter comprising: a keyboard for generating signals corresponding to depressed keys, the keyboard comprising character keys for entering at least character data and a space key for separating the character data entered by the character keys into a single word;   a dictionary memory for storing a plurality of word data corresponding to spellings of words;   a working memory for storing said word entered from the keyboard in a single word form;   spelling check control means for comparing the spelling of the word with the word data, which includes reading out said word from the working memory and also the word data from the dictionary memory, thereby judging whether the word data coincident with the spelling of the read word exists or not in said dictionary memory;   a printer for printing out said word on a print paper in response to a depression of the space key; and   output control means for interrupting the judgement of the word data performed by said spelling check control means and also the printing out by said printer in case that the spelling check control means judges that no word data coincident with the spelling of the word entered from the keyboard exists in said dictionary memory.   
     
     
       2. An electronic typewriter as claimed in claim 1, wherein the spelling check control means comprises acoustic output means for producing an alarm sound when the spelling check control means judges that no word data coincident with the spelling of the word entered from the keyboard exists in the dictionary memory. 
     
     
       3. An electronic typewriter as claimed in claim 1, wherein the spelling check control means comprises correction means for operating the printer to print out a word entered by the character keys and the space key, while replacing the word recognized as the misspelled word when it is judged that no word data coincident with the spelling of the word entered from the keyboard exists in said dictionary memory by said spelling check control means in response to depression of a correction key on the keyboard. 
     
     
       4. An electronic typewriter as claimed in claim 1, wherein the spelling check control means comprises pass means for releasing the printing interruption caused by said output control means in response to a depression of a pass key on the keyboard so as to recognize said word as the correctly spelled word, thereby printing out said word by the printer. 
     
     
       5. An electronic typewriter comprising: a keyboard for generating signals corresponding to depressed keys, the keyboard including character keys for entering at least character data and a space key for separating the character data entered by the character keys into a single word;   a dictionary memory for storing a plurality of word data corresponding to spellings of words;   a text memory for successively storing the words entered from the keyboard;   readout means for successively reading out the words from the text memory;   spelling check control means for comparing the spelling of the word read out by the readout means with the word data read out from the dictionary memory thereby judging whether the word data coincident with the spelling of the read data exist or not in said dictionary memory;   a printer for printing out the character data entered from the keyboard;   a displaying means for displaying the character data entered from the keyboard; and   output control means for interrupting the judgment of the word data performed by the spelling check control means in case that the spelling check control means judges that no word data exists coincident with the spelling of the word read out from the text memory, and for displaying said word on the displaying means, said output control means comprising:   movement displaying means for successively displaying the word with movement read out by said readout means, and   display interruption means for interrupting a movement display of the word when the spelling check control means judges that there is no word data coincident with the spelling of the displayed word, said display interruption being continued for displaying such a word whose spelling is not coincident with the word data.   
     
     
       6. An electronic typewriter as claimed in claim 5, wherein said output control means comprises special displaying means for specially displaying a mis-spelt word under the control of the spelling check control means when the spelling check control means judges that there is no word data coincident with the spelling of said word. 
     
     
       7. An electronic typewriter as claimed in claim 6, wherein said printer comprises printing control means for successively printing out the words read out by said readout means. 
     
     
       8. An electronic typewriter as claimed in claim 7, wherein said printing control means comprises printing interruption means for interrupting the printing operation when said spelling check control means judges that there is no word data coincident with the spelling of said word read out by said readout means. 
     
     
       9. An electronic typewriter as claimed in claim 8, wherein the spelling check control means comprises designation means for designating whether or not the printing operation by the printing control means or the movement display by the movement displaying means is performed in conjunction with the word data judgement that no word data coincident with the spelling of the word entered from the keyboard exists in said dictionary memory. 
     
     
       10. An electronic typewriter as claimed in claim 8, wherein the spelling check control means comprises correction means for displaying on the displaying means the word entered by the character keys and the space key, for operating the printer to print out the word, and for storing the word in the text memory, while replacing the word which is recognized as the misspelled word by said spelling check control means. 
     
     
       11. An electronic typewriter as claimed in claim 8, wherein the spelling check control means comprises pass means for releasing the movement display interruption caused by said display interruption means and the printing interruption caused by the printing interruption means in response to a depression of a pass key so as to recognize said word as the correctly spelled word, thereby continuing the movement display on the displaying means and also the printing operation by the printer.